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Merge pull request #215 from TomHarte/Z80BusReq

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Removes repeated checking of bus_request_line_ by the Z80.
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Thomas Harte 2017-08-20 12:40:37 -04:00 committed by GitHub
commit 5cf0395936
1 changed files with 3 additions and 1 deletions
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4
Processors/Z80/Z80.hpp
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@ -909,6 +909,7 @@ template <class T> class Processor {
while(1) {
do_bus_acknowledge:
while(bus_request_line_) {
static PartialMachineCycle bus_acknowledge_cycle = {PartialMachineCycle::BusAcknowledge, HalfCycles(2), nullptr, nullptr, false};
number_of_cycles_ -= bus_handler_.perform_machine_cycle(bus_acknowledge_cycle) + HalfCycles(1);
@ -918,7 +919,7 @@ template <class T> class Processor {
}
}
while(!bus_request_line_) {
while(true) {
const MicroOp *operation = scheduled_program_counter_;
scheduled_program_counter_++;
@ -945,6 +946,7 @@ template <class T> class Processor {
number_of_cycles_ -= operation->machine_cycle.length;
last_request_status_ = request_status_;
number_of_cycles_ -= bus_handler_.perform_machine_cycle(operation->machine_cycle);
if(bus_request_line_) goto do_bus_acknowledge;
break;
case MicroOp::MoveToNextProgram:
advance_operation();